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15
Water Connections continued-
WARNING
For protection against excessive temperatures and pressure, install
temperature and pressure protective equipment required by local codes,
but not less than a combination temperature and pressure relief valve
certified by a nationally recognized testing laboratory that maintains
periodic inspection of production of listed equipment or materials as
meeting the requirements of the Standard for Relief Valves and
Automatic Gas Shutoff Devices for Hot Water Supply Systems, ANSI
Z21.22 and the Standard CAN1-4.4 Temperature, Pressure,
Temperature and Pressure Relief Valves and Vacuum Relief Valves.
The combination temperature and pressure relief valve must be marked
with a maximum set pressure not to exceed the maximum working
pressure of the water heater. The hourly BTU discharge capacity or the
rated steam relief capacity of the combination temperature and pressure
relief valve must not be less than the input rating of the water heater.
Install the combination temperature and pressure relief valve into the
opening provided and marked for this purpose on the water heater.
Note: Some models may already be equipped or supplied with a
combination temperature and pressure relief valve. Verify that the
combination temperature and pressure relief valve complies with local
codes. If the combination temperature and pressure relief valve does
not comply with local codes, replace it with one that does. Follow the
installation instructions above on this page.
Install a discharge line that terminates six (6) inches (15 cm) above the
floor, or any distance below the structural floor, to the outlet of the
combination temperature and pressure relief valve. DO NOT allow
water from the discharge line to contact any live electrical part. The
discharge line is to be installed to allow for complete drainage of both
the combination temperature and pressure relief valve and the discharge
line. The water from the discharge line must be directed to a suitable
drain or area that will not be damaged by water Refer to “LOCATING
THE WATER HEATER.” The discharge opening must not be subjected
to blockage or freezing. DO NOT thread, plug or cap the discharge line.
It is recommended that a minimum clearance of four (4) inches (10.2
cm) be provided on the side of the water heater for servicing and
maintenance of the combination temperature and pressure relief valve.
Do not place a shutoff valve between the combination temperature and
pressure relief valve and the water heater, or on discharge pipes
between such valves or the atmosphere.